/Engine/Source/Editor/GraphEditor/Public/KismetPins/SGraphPinColor.h
Called when clicking on the color button
[FReply](API\Runtime\SlateCore\Input\FReply) OnColorBoxClicked ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & MouseEvent )